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The Add-In "Exchange Scan" cannot be loaded and has been disabled by Outlook

After uninstalling the old version of McAfee and installing the new one, some PCs were displaying this message when Outlook was opened:

The Add-in "Exchange Scan" (C:\Program Files\McAfee\Managed VirusScan\VScan\OtlkUI.20091023152755.dll) cannot be loaded and has been disabled by Outlook. Please contact the Add-in manufacturer for an update. If no update is available, please uninstall the Add-in.

The first thing to try when fixing Outlook plugin errors, particularly after uninstalling/reinstalling antivirus programs, is to delete the extend.dat file from C:\Documents and Settings\username\Local Settings\Application Data\Microsoft\Outlook.

If deleting extend.dat does not work, try the following:

  1. Click Tools, Trust Center
  2. At the bottom there is a selection list called "Manage", from there select "Exchange Client Extensions" and click Go
  3. Uncheck "Exchange Scan"